Fluid blast nozzle



March 21,- 1939.

D. (I DRILL FLUID BLAST NOZZLE Filed Dec. 20, 1937 Dani l C. Dfiil INVENTOR.

Bil/6.14. c. w;

ATTORNEY.

Patented I ED STATES PATENT orrlcs 7 2,151,090 FLUID nm'sr NOZZLE Daniel 0. mm, Wabash, ImL, assignor to American Rock Wool Corporation, Wabash. 11111., a

corporation of Indiana Application December 20, 1931, Serial No. 180,755

This invention relates to an improved fluid blast nozzle ed for use of a, type which is particularly adaptin blasting suitable molten mineral materials into mineral wool.

in the p stream of t roduction of mineral wool, a thin he molten material is poured upon a powerful blast of air or steam. This blast separates the stream into tiny molten particles and hurls the particles into the relatively stationary gaseous atmosphere of a settling chamber.

has been learned by experience that the molten stream of lava should be applied exceedingly near or substantially adjacent to the nozzle orifice. When, however, thisis attempted with the nozzle constructions of the -prior art, it has been found that a partial vacuum of constantly variable pressure has been induced by the blast and that this vacuum causes a variable back pressure which causes the lava to be drawn up against the front portion of the nozzle. As soon as the lava comes into contac t with the surface of the nozzle it is chilled. Thechilled lava adheres to the nozzle until it is manually removed or until the force of the blast removes it in the'form-of irregular lumps The major portion of this chilled lava, whether it is removed manually or by force of the blast, is hurled intothe settling chamber and becomes incorporated with the felted strip or bat which is being to rmed on the conveyor which serves able. Due, its velocity however, to the fact that blast loses rapidly after it issues from the nozzle, the cupola man is compelled to hold the nozzle close to the lava stream. Due to the variable suction, no matter how careful the operator 'may be, some of the lava is drawn back upon the nozzle and chilled.

Numerous efforts have been made to avoid this diflicuity, but in as far as I am advised, no satisfactory solution has been found due to the fact that none of the proposed improvements have been so designed as to permit a substantially straight line flow of air adjacent the nozzle oriflce.

The chie f object of the present inventionis to provide a nozzle construction which obviates this dimculty which is found in the production of mineral wool.

In the preferred form of my invention, the upper portion of the nozzleoriflce is separated from the atmosphere only by a. smooth straight rearwardly extending wall of suiflcient thickness to enable the nozzle construction to withstand the necessary fluid pressures. This feature provides a free and unobstructed flow of the air in a substantially straight line both above and to the rear of the orifice opening.

In the accompanying drawing:

Figure 1 is a front elevational view of the preferred form of my invention;

Figure 2 is a section taken along the line 2-2 of Figure 1;

Figure 3 is a section taken along the line 3-3 of Figure 2;

Figure 4 is a front elevational view of a modifled form of my invention;

Figure 5 is a section taken along the line 5-5 of Figure 4; and

' Figure 6 is a section taken along the line 6-6 of Figure 5.

The preferred form of my invention shown in Figures 1 to 3, inclusive, comprises a preferably metal tubular member I, the lower portion of which is open and provided with internal threads 2 whereby the tubular body is adapted to be connected to a fluid pressure supply pipe, not shown. The upper portion of the body I consists of a, double wall V-shaped member 3 which is welded or otherwise made integral with the tubular member I. The upper and outer wall portion 4 of this member 3 is imperforate but the lower and inner wall portion 5 is provided with openings 6 through which steam, air, or other fluids may pass in between the two wall portions before it is discharged from the nozzle opening I, which opening is preferably formed by merely leaving the front end of the double wall member 3 open. The rear end of this member 3 is closed, as indicated at 8, by any suitable means, such as, for instance, by welding.

From the foregoing description'the operation of my invention will be readily understood. The tubular member I is threadedly connected to the pressure supply pipe and the valve of the pressure supply pipe is opened, thereby admitting steam or air, as the case may be, to the tubular member. The fluid passes through the opening 6 and discharges from the nozzle opening I at a high pressure. The fluid is usually under a pressure of approximately 100 lbs. per square.

inch. The resultant blast has. at the nozzle opening,

an extremely high velocity. This blast' canies with it a substantial amount of air and tends to produce a vacuum. Due to the free, straight, and unobstructed passageway 9, the air is permitted, however, to freely follow the blast, and no appreciable vacuum results. The absence of an appreciable vacuum pressure permits the nozzle opening to be held exceedingly close to the stream of molten lav'a without causing the lava to adhere to the nozzle. passes in a continuous stream through the chanhe] or air passageway 9 and this air stream blows the lava away from the upper wall portion 3 and from the nozzle orifice. Inasmuch as the front portion of the double wall member 3 extends in front of the tubular member i, the air is also permitted to flow adjacent the outside of the wall portion 6 as well as Within the channel way It'is, therefore, apparent that this construction permits the airto flow freely on both the inside and the outside oi the front portion of the member 3, thereby preventing, for all practical purposes, the building up of any back pressure around the nozzle opening.

Figures 4, 5, and 6 show a modified form of a my invention. This form includes a tubular section it which is open and is internally threaded at either end. One o'f'itsends is closed with an exteriorly threaded plugi2. The other of its ends is adapted to be attached to be threadedly connected to a pressure supply pipe, not shown. The mid-portion of the tubular plug carries a. preferably unitary V-shaped double wall nozzle portion it which serves the same function, as the double wall portion 3 of the preferred form of my invention. The rear end oi this wall por The air, in practice,

said roof portion.

tion is' closed as is indicated at H. J The front end of the wall portion 18 is left open to provide a. nozzle outlet 15., The outer wall it of the nozzle portion does 'not extend within the tube H as this part is eliminated to permit the fluid to freely pass through the tube to the nozzle opening IS. The tubular section II and the V- shapeddouble wall portion. It may be cast as a single unit-,"or the two parts may be welded to gether in' a manner well understood by the art.

The preferred form of my invention is particularly adapted to be connected to an upright pressure supply pipe. The modified form is equal ly adapted to be connected to a horizontal fluid pressure supply pipe.

In the foregoing description, I have shown but entrant substantially V-shaped roof portion extending the entire length 01 the upper part of said member and having an orificed portion immediately below said roof portion and so arranged and constructed as to produce a steam or air jet being substantially V-shaped in crosssection and projected in a direction substantially parallel to a plane passing longitudinally through DANIEL C. DRILL- 

